Automatic stop for phonographs and other rotary mechanism.



,I i mi. imam` i AUTOMATIC-STOP Fon P'HoNpGnAPHs Ann OTHER 'fxonmrrmscuArusraf4 APPLICATION FILED IULY20`. I9I5.

` ggg-951; Patented Jan. 8,1918.

N .i If wu Affi.

'Mechanisrn,

UNITED s'rArEs PATENT. oEEIoE.

HERBERT E. RIDER, OiF BROOKLYN, NEW YRK, ASSIGNGR T0 AUTOMATI PRONO-STOP COMPANY, INC., ACOBPORATION 0F NEW YORK.

Auroma'rro s'ror' For. rHoNoGE'ArHs AND OTHER no'ramr MECHANISM.

To all whom it may concern:

Be it known that I, HERBERT E. RIDER, a citizen o f the United States, and a resident of Brooklyn borough, New York city, and State of New York, have invented certain ncwand useful Improvements in Automatic Stops for Phonographs and other Rotary of 'which the following is 'a specific: tion.

The object of my invention is to provide a sim 1e, stron for p onograp s and other machines, whic comprise a rotating disk, drum, wheel or other rotary mechanism, which it may be desirable or advantageous td check silently 4and safely at some special point of its runheretofore such stops as have been ein?" `frequcn1ly requiring re-adustmenl to in- 'preferably a rolling,

sure a proper repeated action. In my device the action of the'stop is absolutely regular and automatic, only one ad'ustment being required for a given size o rotary device to be acted upon; the braking action is silent'application of be termed a spring like or elastic increasing pressure, whereby the rotar mechanism', however delicate, and tlirougi it the machine itself may be brought to a. full stop without injury,

To this end my invention consists broadly of a suitable friction bracket, swingingly mounted upon a spring friction bearing, adapted to be adjusted in any desired position so that in its travel it will contact with what may the rotating device at such (pre-determinech point as may be desired an necessary for the proper stoppage thereof;

Many different forms of apparatus or bracket may be constructed, as desired, e1nbodying thisrinciple without departing from` my invention and I .have therefore selected for illustration in the accompany ing drawings one of the simplest embo iments of my invention, namely u steel spring structure, adapted for .application to the tone arm of a phonograph or talking'4 machine the reproducer of which is fed across 1 the record by a spiral groove.

This particular device can tured at such small cost that it is available for use even with the least expensive phono Specication of Letters Patent.

'Application tiled July 2B, 1915. Serial No. 42,478.

and effective automatic stop Patented Jan. 8, 1918.

. tion Vbearing 'to permit and govern the adjustment of the bracket shown in Fig. 2.

Same letters indicate similar parts in thc different drawings.

A, is the cabinet or casin containing the phonograph. B is the need e carryinv arm. C is the needle holder. D is the needle and E is the phonograph disk, on which the needle travels. All these parts are of usual and well known construction. y

My improved stop, as here shown, consists of a suitabeI frictionA bracketF, liaving rolling friction tip G, and swingingl mounted upon a spring rlction bearing Ii, which may take the formof a split. washer as shown in Fig. 3, a spring bronze washer or other suitable forms. p

This bracket is designed to press 'against Vthe periphery of the phonograph disk E. at

the proper time with sufficient yieldinrr force to brake its action gently and stop its further rotation and therefore may be swingingly mounted in su'ch relation to the needle carrying arm B, as maybe necessary to cause said rolling tip to act at the exact instant desired. A convenient way of mounting this swinging bracket to accomplish this result is, as shown, a supporting spring arm which forms a part 'of an adjustable clutch loop or yoke K, adapted to be drawn to'- gether by the screw-bolt L, and winged-nut M., This adjustable yoke is designed to encircle somo part of the needle carrying arm B and to grasp the same with suiliclcnt lirlnness to be moved in unison with said needle arm.

A record being placed in position on the phonograph, the needle arm, before starting Other and more elaborate :forms4 the the mechanism, is moved so as to bring the needle directly over the last note indentation onthe disk and the rolling tip is then brought by hand into proper contact with the edge of the disk by applying sufficient force to overcome the grip of the spring friction bearing, and is then released. The sprin friction bearing thereupon holds the swinging bracket in that exact relation to the position of the needle carlving arm, nir til occasion should arise to alter the adjustment by again applying sufficient pressure tr,- ovcrcome the power of the friction bearing. The needle arm, carrying with it a swinging friction oracket, is now brought, back to the beginning of the piece to be played and the phonograph is stopped.

It will thus be seen thatas the needle, traveling over the disk, approaches the last note of the record thereon, the friction ti. will be brought. against the edge of the disl't and gradually cause further rotation tov cease, suchl grip becoming ultimately effective when the last note is reached.

The principle involved 1n this automatic stop, whether applied to phonographs or other moving or rotating mechanism or devices, is that the pressure constantly exerted by the friction bearing, around which the bracket turns should be sufficient to overcome with a somewhat yielding but continuous pressure the power which rotatesor moves the apparatus which is to be stopped, but small enough to be itself overcome by hand when re-adj ustment becomes necessary machine.

HERBERT E. RIDER. Witnesses M. DAVLY, YV. P. Panche. 

